- BerlusconiMarch 2020
几：1，2，3，4 。。。9 (years old - small girl, small boy)
你多大了？This sentence can be used in Adults or Children or tenneger,if change ‘你’to ‘您’,it is express the repect.
你几岁了？This sentence always used someone ask the children.Generally not used for adults.
Nearly same. If strictly, personally I would feel the second one is used for asking a child generally.
You can see this dialogue to know the usage of "how old are you" in Chinese.
Also, you can join the wechat group: jenniferzhu6 to learn Chinese everyone with other Chinese learners.
sometimes depends where u r speaking chinese cuz some words have slightly different meaning in other places