It makes sense to go through its accounts, contracts and commitments when taking over a company that has already been in business. The age of the company itself will not tell you anything about its current activities or financial situation.
What to request before selection
Start with the IČO, the current extract from the register and the available financial statements. Ask if the company is still fulfilling obligations under previous contracts, has employees or open disputes. Write in demand why history is important to you and what activity you want to operate in the company.
If you need a company without prior operation, compare also ready-made companies and forming a new s.r.o..