There are some things that break through the generations. Sometimes, when one gets older (I'm 50) simple things like teaching someone to shave (properly) can be really fulfilling. When I taught my older son to shave with a straight it was quite momentous.

Actually, the best response to this is 'good on you for taking the time'. A lot of guys don't 'take the time' with their kids, grandkids, etc. We all MEAN to, but sometimes it gets a lot like that 'Cats in the Cradle' song; you know the one. We should all just slow down and take time to smell the shaving soap...