This may say more about my current level of touch deprivation than about the thought experiment itself, but my first thought is "where are you getting access to any targets?" Presuming a handshake or high-five is sufficient, I'd have... three days this year where I could have used this power, all high-fiving various supervisors at work. If I can do it through clothing (but it has to be an intentional touch, not just an accidental bump), that adds two more people and a few more days from shoulder-pats and hugs. So it's not like I could slow my own aging or accelerate anyone else's to any appreciable amount, quite apart from my actual attitude toward the concept (which as you can guess is pretty much "meh, why would I bother?" I never expected to make it past thirty. Which is apparently a PTSD thing, but still. If I live long enough to die of old age I'll be very startled.)