I can get behind the idea that older characters now could be bothersome realms.
Hell, I even have an 'older' (in his 60s I think?) character duke & lord for ages. I can see how that could become a problem.
For me the problem is that it's just not realistic to have 100+ chars around acting like they are 21. People just don't play their old characters as old !@#$s who are barely able to do anything anymore. Because well, the game mechanics don't burden their actions.
As far as incentives go, I think Lancaster summed up some I would have thought of first hand as well:
- H/P boost
- Skill boost
- Unique Item
Depending on what the old character had.
I'm interested to see more 'incentives'. Because I do bbelieve we should encourage people to not play characters whose age is too damn high.