Signs your consumer unit needs replacing
A consumer unit, or fuse box, is worth having checked by a registered electrician if it still has rewirable fuses, has no RCD protection, shows scorch marks, smells of burning, crackles, feels hot, or trips repeatedly. Age on its own is not proof it is unsafe: an EICR is how you find out whether it needs replacing. Replacing one is notifiable work under Part P of the Building Regulations in England, so it is a job for a registered electrician rather than a DIY one.
Source: Electrical Safety First (opens in a new tab)
Read more about consumer unit warning signs