Sticking dropped door request for advice

[GlennSpray68]

Hello all, I hope someone can help with the following issue.

My elderly father in law back door has dropped in the frame

Unfortunately as he is 88 he does not want to replace it with a new one.

The lock latches have dropped by approximately 5mm.

If somebody could please advise me what would be the best way to resolve the issue with the door.

Please see the attached images for more concise information.

Many thanks in advance for any assistance

 

[foxhole]

Looks like an internal door that’s been used as an external door, panel doors unsuitable, really needs replacing.
Looks to have come loose on top hinge .?

 

[GlennSpray68]

Hi foxhole,
Thanks for your prompt reply
It's been in situ for 40+ years!
I checked the hinges and neither of them are loose, there's no movement on the door when I try to lift it square.

Thanks for your assistance
Glenn