1. She's in her early twenties. (=20-23 years old) 2. He's in his late thirties. (=37-39 years old) 3. She just turned six. 4. Act your age! (use this when an adult is being immature, acting like a child) 5. I'm not as young as I used to be. 6. I'm not over the hill yet! (over the hill = an informal expression to say "old") 7. He's no spring chicken. (= he's not young) 8. She's wise beyond her years. (she is young, but she has the wisdom of an older person) 9. I'm having a senior moment. (= I'm being forgetful) 10. He lived to a ripe old age. (= a very old age)
You may be very good party planner, but its still not advisable to keep all the work for yourself. You can get tired and be zapped of all the energy by the time your guests come. So, either hire outside help or engage your family members. Divide the labor, but keep on inspecting the work. Be gracious if any problem occurs. A party is meant for having fun, so do not let anything ruin that for you.