Basically I want events to remind you that your charachter is getting old. So what do you think about this?
Some events would be cool, but honestly the examples are awful, almost always bad ones...
As a count, duke, a 60-70 year old should be better then a 30 y/o one. In general, except for like personal combat skill or bed acrobatics, a experienced guy is almost always a winner...
The problem with the idea is that bad things related to aging (like an aching back, or the inability to climb stairs) is NOT effecting martial/stewardsihp/diplo/intrigue/prestige/piety at all.
These would make sense in a game with a different scope, and these work very bad in a grand strategy.