Can I enter Thailand with a new passport if my e-Visa is on my old one?

Delayed first entry is usually about whether the visa is still valid and your purpose matches the file — not a magic 90-day stopwatch everyone enforces the same way. Bring the approval/DTV letter set and keep the activity story consistent. Anecdotes help; your validity window and documents decide.

I entered a year after visa was issued, no questions at all.

You can let it lie dormant. Kap.

I entered after 6 months. Before immig, I saw my picture on so many "missing person" posters. It was afternoon and line to IO was veryyyyy long. Not long until a staff member saw me. He pulled a poster and tried to match my face. After that, all I could hear was chaos, wireless, instructions from their seniors. They pulled me out of line, escorted to a private room. Head of immig postponed all their meetings, came to meet and greet, and asked me just one question, "where were you all this time. We were waiting so long for you. We just lost hope. We thought we won't be able to see you again. We were in the process of issue your interpol warrant."

If you don't want to be arrested by interpol, make sure to travel within 90 days. Thanks for reading my fiction piece.

Visa is valid for 5 years, upto you when you come and go. Not really rocket science

You can find posts from such DTVERS in the threads. As you said, you have 5 yrs to enter.

It is a 5 year Visa

What not to understand

Complete silence as they were immediately abducted by aliens.. 👾