How do you know what similar properties are selling for?
You can't, they may have got well below asking and you won't know until it hits the public access info about 9 month to a year later (3 months or so for conveyance and 6 months or so to become public). By that point its just a guide not relevant to the current market.
Rightmove & Zoopla do NOT take into account 'state of repair' and Estate Agents usually build in at least 10% in overpricing (to allow for later price drops) and anticipate up to 10% for under offers.
As for condition, they recommend to retain house value that bathrooms should be referbed every 10 years (its been 13 years) and kitchens every 20 (it been so coming up in a few years) so both are somewhat 'old' and likely dated (we are halfway into the next decade with opposing current styles, 2010s was all about greys and brilliant whites and clean lines, 2020s is all about bold rich colours, period details and 'colour drenching').
Yes they can last decade long but as 'doer ups'. Just because they are not 80s doesn't make them new/modern they are at the end of their 'recommended' life.
Using the same time frame say if you bought a ford in 2012 for £15,995 you wouldn't expect that now and market it as a 'new' car when selling it, even if its still running fine its only worth £2,000-£3,750 (depending on condition etc...).