newborn
She's 3 day's old .She's a newborn baby .
toddler
She's 18 months . She's a toddler .
Child
She's 8 . She's a child .
She's 20. She's an adult .
1.He's 28. He's in his late twenties .
2. He's 35 . He's in his mid – thirties .
3. He's 42 .He's in his early forties .
4. He's 48 . He's middle – aged .
5. He's 85 . He's fairly elderly .
Eldrly is more polite way of talking about old people .
I have got a two – year – old son .
They have got a two –month – old baby .
They are all 10 years old . = They are all ten – year – olds .