The phrase “too old, meand nothing” is not correct English, so it’s understandable that you’re confused.

Let’s break it down.

1⃣ “meand”

This is almost certainly a typo. The person probably meant:
• “means nothing”

2⃣ What does “too old, means nothing” mean?

Grammatically, it’s incomplete, but the likely meaning is:

“Being too old doesn’t matter.”
or
“Age doesn’t mean anything.”

It sounds like someone responding to an age-related comment and saying that age is irrelevant.

3⃣ Why it sounds strange

Correct versions would be:
• “Too old? It means nothing.”
• “Being too old means nothing.”
• “Age means nothing.”
• “Too old doesn’t matter.”

The original sentence is too broken to be called English.