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)
When mentally tired or when laziness creeps into your study time, do yourself justice by simply reading through the subject material. Read with comprehension and understanding. This will help you tie up information on the day of exams.