[Australia] 2000 toyota rav4 cruiser. Mechanic said front left strut is leaking oil and that it will be roughly $1000AUD to swap the 2 front struts with new ones. Is this a reasonable?

Also could you not just disassemble the struts and put new bushings in and fill up with oil instead of replacing? Or would it be worth replacing considering they may be 25 years old?