How to Send parameter Value in function of deployed contract using Web3.js?

pragma solidity ^0.8.0;
contract Age{
    uint age;
    function EnterAge(uint Age_ )public{
        age = Age_;
    function GetAge() public view returns(string memory, uint){
        return('Your Age is ', age);

I want to send value in EnterAge(__) through web3.js.

Hi, welcome! :wave:

I think you can have a look at the documentation of the web3.js

I have 15 contract Files so should i merge them into a single file or upload in Multiple files?
What's the professional Approach?
Please Elaborate.