People also seem to forget, Steve was twenty five, TWENTY FIVE when he went into the war and the ice. Steve is barely older than a teenager, and has gone through so much. Bucky was 25 when he fell to his 'death' and was tortured by Hydra.
Merry and Pippin are awesome friends! Ok, the entire Fellowship was made up of awesome friendships. But Merry and Pippin's was quite striking because they were very different from everyone else in the Fellowship - in the whole movie, really.