well if you follow musical trends your music is more likely to become outdated faster as trends change and die off.
I personally loved the whole dance-pop craze of 2010-2012, but yeah that sound is so over with.
Well, in my opinion, some songs have aged very bad, especially those generic EDM songs with dance breakdowns, like 'Starships', while many others still sound fresh, because the production has that timeless quality. For example: 'Somebody That I Used To Know' and 'Call Me Maybe'