understanding how great our bodies r created helps us understand lots of things … 
biologically, we as humans have different systems … how to best fine-tune the balance between those systems developing … and how they are supposed to function is one of the real beauties of how we are created perfectly… those functions differ in the timing of when it is needed and differ in how much perfect they need to be at a certain point in our age … … and it might explains to u how we deal with viral infections very differently at different points in our age … 
lets see some examples …
two of those most developed system we are born with, almost completely developed are the brain … and our audio visual axis … and to understand how relevant that is …imagine those two …developing like our musculoskeletal system for example that continue to grow and develop … tell we are in our mid twenties … slow and steady and progressive …ask urself how would we have developed mentally and intellectually … if we spent the best of our growing yrs not cerebrating perfectly and not seeing or hearing our environment optimally … we would have been all mentally challenged idiots if that happened … so we are born ready to understand …“brain” …and see … “eyes” …and hear…" ears" …the world that surrounds us … by 2 yrs the age when we are ready to march the earth … we are totally and fully developed to interact and affect our surrounding environment … that is why i always say the most beautiful thing in a baby face is his eyes … as it is the most developed and most obvious …and one final note there is a difference between being mentally challenged …and mentally retarded …both words r used interchangeably …and that is very very wrong!!! … just remember “”"“mental retardation is a disease … mental challenge is a context …”"" being blind or dead or having severe cerebral palsy … without a very very special care and aids …u would then be a mentally challenged …NOT RETARDED … a distinction should be made and clearly here …
even within the skeletal system that i talked about … there is very differential growth pattern to different parts of the body …a notable example is the FOOT !!! …why and how …we are born with feet small yeah but one third of the length of the adult foot … way advanced percentage than that of the femur for example “compare the baby femur to its adult one length percentage!!!”… why is that differential growth …because our feet are our base of support …and if u created a creature … whose feet grows in tandem with the femur … …we wouldn’t have been able to stand on them tell we are way into our childhood and that would have greatly been disadvantageous to our development and maturity … having a stable reasonably big base of support specially that we need to be bepedal in standing and unipedal during walking …just as much as delaying femoral rate of growth to keep the COG closer to the base of support … both are ABSOLUTE NECESSITIES for us to learn how to stand then walk and fast enough to ambulate and march the earth … ppl think that walking is solely for ambulation but no ladies and gentlemen …it is way beyond that … walking makes ur environment just as rich and as variable …as the reach of ur legs …and wherever it takes u … walking is the most cerebrated human activity …as it takes u …everywhere and in everywhere …ur brain and eyes and ears can process …EVERYTHING … IT IS way more than just ambulation … … without such rhythm … our perfectly made brains, eyes and ears wouldn’t be allowed to build our understanding and perception of this world …the very first step to influencing it …
but being children … not wise and not careful and very unwisely adventurous … puts us at risk … at risk of injury …at risk of not protecting ourselves from harm and pathogens … so we are made relatively softer and lighter …and much more immune-wise prepared than adults … one of the very big risk of being children is catching viral infection … do u know that … lymphocytosis … is almost diagnostic …i said ““almost 
”” of lymphoma in adults …when it is NOT in children … why is that …because the lymphatic immune system is highly mighty in children And we all know that the lymphocytes is the part of the immune system ““the cell mediated””, …is the one big faction of the immune system that is entitled with viral infection resistance … and it undergoes evolution and diminution …as we grow into adulthood … so lymphocytosis in children is almost physiological given their exposure to lots of viral infection and how frequent that is …and bear in mind … a measles infection in a child due to his mighty lymphatic system might give him some fever, skin lesions and mild upper respiratory symptoms …if we as adults caught it …mostly, it will kill us from pneumonia, if we haven’t been exposed to during childhood …and that explains why ANY ADULT and specially if ur old age …ur specially vulnerable to viral infection when children appear to take it with little if any symptoms … this evolution … is physiological as we are supposed to be more protective and wiser growing older … so plz do that … BE PROTECTIVE and be wise and stay home when there is risk of viral infection … wandering the street … … … and stay away from children …who might catch it … tolerate it … and live with it …but give it to u … and that can kill u … stay home and away … i hope clear enough … 
and understand that … staying away however careful …doesnt provide total isolation …and doesn’t mean u wont eventually catch it … it just means … it might delay ur exposure … luckily to a time when there is a cure maybe 
… luckily to a time when the hospitals are not overwhelmed … maybe … luckily to a time when a needed ventilator or an ICU bed ““god forbid”” … can be found… maybe … BE WISE AND PROTECT URSELF AGAIN …
i can go like that talking about each and every system … but it was just a thought i wish u to understand … thank youemphasized text