[Sephiroth]

Can those of you with some knowledge about viruses fill in some gaps on stuff we're not told?

1/
We are told that younger people retain CV antibodies for longer than older people. The deduction made from what we're told is that older people remain susceptible to serious consequences of a second infection.

2/
Let us say that an older person in their mid 70s can shake a cold off in a couple of days. Are they likely to be typical of that age group or luckier?

3/
By corollary, is an older person who is able to shake off a cold in two days in a better position to generate CV antibodies than less cold-shake-off-able people?

Thanks in advance for your opinions.