...歲了 marks a change in age (turning a certain age).
Age change - Highlights reaching a new age
Often with time markers - 今年/明年, etc.
See examples below for varied real-world usage.
Use 歲 for age
- ✅ 我二十歲了。
- ❌ 我二十年了。
Change of state — implies reaching that age
- ✅ 她今年十八歲了。
- ❌ 她十八歲（no change).
I am eighteen now.
My younger sister is five now, and starts elementary school this year.
Grandpa is seventy now, and still walks every day.
The baby is one year old now, and can say mom.
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