Old and cared for or young and…

Hello, I just don’t know how to decide: So my car is 13 years old, has almost 190000 km on it. Now it’s not worth investing any more. So another car. There’s an offer: Peugeot 309 over 15 years old. Very well maintained (“Opa” has made continuous inspection etc.), 70000 km. Timing belts and ignition would be due. And all for a small money. Interior, engine room everything like “keeps”. even the car workshop is enthusiastic. Or a car that costs 4000 Euro about 300 km a month. Of course such an old Peugeot, but very well maintained. Or a newer car. With the Peugeot, I would drive for a while now, by the way, save on a new car in about 3 years. Then I can afford something “good” for about 10,000 euros. Bzw. a down payment and then continue to finance in installments. What would you do? Nice greetings Heike