You must be at least 19 to rent a car in the Netherlands to rent a car, but most companies request a minimum age of 21 with two years of driving experience. For more powerful cars, the minimum age can increase to 25, with three years of driving experience. Most companies will also charge an extra fee on top of the normal price if you are under the age of 25. Rules vary between car suppliers, so always check with individual companies to find out about their policies.
You should also contact the company in question to make sure they accept non-Dutch driving licenses and identification. While some companies accept foreign driving licenses, others require a Dutch driving license, credit card and passport/identification. Licenses printed in a non-Roman alphabet (Arabic, Chinese, Japanese, Cyrillic etc) must be complemented by an International driving license. Always remember to bring a valid ID card or passport at time of pick up.
There are a number of different suppliers in Maastricht where you can get a rental car. Some examples you might want to look at are Sixt, Adrem, and EuropCar. Again, make sure you always call and check with the rental company that they will accept non-Dutch driving licenses and passports. There are also a number of major car rental companies available from the airport. If you don’t know which to go for, it might be worth checking out a comparison site like this.