Is 18 dating a 24 year old too old? What about 18 and 26?

Anonymous
For the past 4 or 5 months I've been seeing guys 3-6 years older than myself. I'm currently seeing a guy that's 24. I've been asked out by a 26 year old and I'm not sure if that's too old. I would get married and have kids young. Around 23 or 24 for kids and maybe younger for marriage. I don't know if people would look down on it or even notice? What's your opinion?
Is 18 dating a 24 year old too old? What about 18 and 26?
26 Opinion