Good quality window tint is very resistant. On my DD, i have had tint on since 2007, no issues at all and I wash/detail my cars religiously. It all depends on the film used.
As for night visibilty, i am getting older as well, but its not too bad,again if a good film is used.
Aside from that it boils down to personal taste. On my other cars, I wouldn't have it any other way, however on a vert I still don't what I would do, or will do for that matter. But if I did, again it would be very light