For a normally driven car, say yearly <10000 kms, the depreciation is 10% per year. So based on the year of manufature and the base cost, you may self calculate the expected price.
For cars doing more kms / have been in accidents / out of manufacuring (which accent is, and probably few years down the line spare parts will be an issue) the depreciation is higher.
Please confirm servicing log before doing anything. There could be odo tampering / accident history in worst case. Also ask for the insurance premium receipt. That has a price quoted for max insurance (this price is without electricals / rubber / battery). hence this is the minimum value a seller will expect, as that defines the price of car.
If RC book / insurance / servicing log is not there, this may be a stolen car or in contention of some police case. Just to be sure, confirm chassis number, engine number, and registration number in RC book(to confirm it is not a duplicate made for a stolen car). Also ask for spare key and the service book/manual. An actual owner will have it.
If after doing all these, still you find no issues, and seller wants just 45K for this car, man you have hit a jackpot