When I was chronologically "60", I was totally unaware that I was meant to be "old". Jokes about age are ageism and as inappropriate in general as racist or ethnic jokes. When friends turn 50 or 60, I send them, or sing to them, to the tune of She'll Be Coming Round the Mountain:
O, it's nifty to be ?? years of age
All the youngsters think that you've become a sage
And the oldsters born before you
Think you're young and just adore you
O, it's nifty....

Most people seem to be upset at these times and need to be cheered on rather than picked apart. Younger people tend to do the picking to make themselves feel better, without realizing they may someday get there themselves -- if they are lucky.