How do I access my old photos on iPhone?

Yo10yo00 wrote: How can i access my old photos

That depends on what you mean. You can enter a date in the search field:

Here I've entered "1852" and I get some really old pictures-- daguerrotypes that I scanned.

If you mean "old photos" that used to be on your phone but no longer seem to be there, then you can try the "Recently Deleted" folder in Utilities. Deleted pictures remain there for 30 day unless you prematurely erase them. You didn't say what iPhone you're using nor what iOS it's running, so it's hard to be more explicit.

See this:

         If you're missing photos or videos in the Photos app - Apple Support

If the pictures are not there, and if you think that they once were, then the only other place to look is at backups you may have made. If you've backed up your phone to your Mac using Finder, or if you used iCloud backup, then see this:

Restore your iPhone, iPad, or iPod touch from a backup - Apple Support

Good luck on the search…