please clear my doubts

i very well know that a person aged 18 or above is eligible to open an adsense account.

now please tell mewhat is the maximum age limit to open an adsense account.please be specific here.

for example-one of my friends' father who is 62 years old(he is from india) wants to open it,to display ads on his site.is he eligible at this age?

if yes,till what age will google allow him to show ads on his site?

please reply..