(I am submitting this entry as a lay person: my expertise does not lie in medicine or psychiatry and as such I'm sure that the seed of an idea I'm presenting here would need significant refinement in order to be relevant/useful)
Today there are many popular video games that are played online against other players. Games in which players compete against each other often have ranking systems to help pair players against opponents near their skill level, similar to the Elo ranking system used in chess. Since a player's ranking level follows their performance in the game, it reflects a combination of their cognitive ability, manual dexterity, and communication skills (in the case of team based games).
While I'm not sure that many elderly individuals at risk for Dementia or MCI currently play these video games, I think it will become more common with time (as generations more familiar with computer technology reach advanced age). With enough elderly individuals playing, it should be possible to establish "healthy" performance trajectories with age, measured quantitatively through the ranking system of their preferred video game. If someone has a performance trajectory deteriorating more quickly with age than expected for a healthy individual, they could be alerted to seek professional attention in case they are experiencing the onset of Dementia or MCI.
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