The question is not how old you are but it depends on how you are going to manage the situation.
You may be having your sons or daughters or sons in law or any one else to support your cause.
You cannot approach high court for removing this civil nuisance created by him by making his drainage or waste water to flow into your land just because it is a vacant land.
He cannot misuse the situation in his favor.
If he has the support of goons, then you may have to approach the competent authorities with proper complaint either by yourself or through your advocate.
He is taking the advantage of your absence and playing havoc on your vacant land.
Her is trying to put pressure on you to sell your land to him at a very cheap price.
If the local civic bodies are not cooperating with you or not taking proper action on your complaint to remove the drainage he built making the drainage water to flow into your land, then you can file a suit for mandatory injunction against him restraining him from allowing his weaste water or drainage water to flow into your land and also to remove whatever such facilities that he has made for easy flow of such waste water into your land.
If your neighbor acts unreasonably or carelessly with water on his own property in a way that causes water damage to your property, you can sue for compensation for your losses and also ask the court to order the neighbor to stop the action.
Any action including filing a suit against him before the court competent would require your presence/constant and regular follow up with your advocate, you cannot just like tht remain silent after filing the suit believing that the advocate will take care of rest of the issues.