Should i give these clothes away? age related 2.?

Hey i'm cleaning my room and am going to get rid of some clothes for my step dad to take to colombia...it's hard for me to let go of things i always keep things i end up not needing. But my question is...i have some clothes i have not used in maybe 2 years...some halter tops, pink tops, capris, etc. Am i too old to wear some of those clothes and should i just give them away? I just turned 20 last month...officially not a teenager, should i throw/give away my old halters because i have out grown them*i still like them :-(*? I still like them but would i look like i'm trying to look like a teen when im not? I don't want to look like an adult "trying to hard" to look younger, but i still like those clothes. please answer need to get this ready in 2 hours...thanks