Question

how do you serve your parents when he become old

Answer 1

Talk to your parents about what you want. If you do a lot of work and then just say, "Can I have/go to _______?" then they will feel used because you did work just for you. Show them first that you want it for you, and do something in return.
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2
Try doing chores around the house. Show them that you're not afraid to work for what you want. Try doing something you never do, such as washing the dishes, cleaning the pet's cage or litter tray, taking your dog for a walk, doing laundry, folding clothes, mopping, washing windows, cleaning the toilet, etc.
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3
Try doing extra credit work at school and/or study hard and get good grades. This will show them that you can balance school with home.
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4
Try to avoid childish behaviour. If you want to be trusted, you need to behave maturely. Not only does this mean behaving like an adult, it means speaking like an adult not like a child would. Don't say silly words or wind others up, and your parents will think that you have a sense of maturity.
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5
Avoid things they don't like. Stay away from the bad crowd at school. Don't watch that television show your parents hate, find trashy, or don't approve of. This will show that you do care about their opinion, that you aren't just going your own way, and that you can listen to them.
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Go out of your way to compliment them, or do an extra chore. Little things like this show them that you really are responsible.
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Prove you can take care of yourself. If your parents come home from work, exhausted, don't pester them to make dinner for you. Make it for them! If they're gone shopping, take the time to make the house spotless; they'd really appreciate it.
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8
Be punctual. If your curfew is at 11, be home by 10:30. If your school starts at 8, wake up at 6:30 instead of at 7:30. You won't have to beg your parents for a ride. Let them know of all events in advance. Prove that you can manage yourself.
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9
Be sure to do your daily chores and don't be lazy. This will show your parents you will be willing to take care of the something you want. This also shows that you are going to be consistent with this mature behaviour, and that it's not a one-off to get something.
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10
If you want a cellphone show them that you are going places more often and need to stay in touch a little more. If they give you a small cellphone to use, don't whine about it. Be grateful that you have a phone now, and maybe, if you show that you can look after the phone and be responsible with it, they'll upgrade it to something better.
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11
Tell your parents that you think you are old/responsible enough to go to/ have what you want. Give them examples, but only a few (important ones, of course) so you don't sound like a braggart.

Answer 2

We will never feel them alone and will always ready for their help
We will also take their advice too so that they must think that they are also main member of the family.
We can also celebrate every festival together instead of celebrating with friends