what constitutes a senior citizen?

yesterday at my dad's fourth of july pool party, my cousin caleb was talking about senior citizens and age. he made the comment to me, "you're like almost a senior citizen..."

ouch.

"i am not even close to being a senior citizen!" i said to my 20-year-old cousin. "i'm only 30!"

my sister's husband chimed in. "you BROKE YOUR HIP!"

so, i guess i really am a senior citizen already.