email with life expectancy

back on the simple but useful front. I was wondering about a life time for email.

After spam my inbox gets full of invitations. I don't want to get rid of them until the event is over but then I generally forget to delete them leving me with a large inbox.

Perhaps email should have an 'expected lifetime' after which it would invite the web browser to automatically refile its self into a paste events folder. the past events folder could be a trash or timed trash( delete in 14 months).

So every time I quick or opened my mail a dilog would appear to say 'hay' you have 6 passed events in your email inbox do you want me to automatically refile them?(yes please/no thanks).

So to make his work you also need a box that says.
'I noticed you have a date in your email. Would you like to me to make this email a timed email so that everyone will get an automatic notice to refile after the date is advanced ? ( yes please/no thanks).