In reply to Rog Wilko:
Spouting BS based on prejudice and assumption not peer reviewed research but it seems to me that...
In a similar way that we need to have a healthy balanced diet with lots of variety, not pick a single theoretically "best" superfood and eat exclusively that. Mental activity also needs wide variety as well as challenge. There is no one single activity or phone app that is some magic answer, rather you need to engage your brain with a diverse range of active (not passive!) challenging activities that you enjoy
Like picking from several of major food groups, you need to pick stuff from several major thinking groups.
* Plasticity (fancy way to say learning new tricks). Duolingo - totally free! Spend 10 minutes every day working on a language
* Numbers and patterns - pick some puzzle app or do the sudoku or whatever floats your boat
* Words - crossword, word puzzle whatever floats your boat
* Short term memory games of any kind. The first thing we lose is short term especially future memory, so exercise this part of your brain ("future memory" is remembering to do stuff in the future, like remember to switch the oven on at 6pm, don't forget to tell your neighbour about whatever next time you see them, or what did I just go into the kitchen for????? This is future memory)
*Social stuff - keep doing your bridge!
Don't underestimate the physical, keep in shape but prioritise
1) Short high intensity stuff not low intensity steady state, you want to improve peripheral circulation and small vessel health.
2) strength - like very low rep strength training, I mean improving your 3 rep max not doing something for 20 reps! Type 2 strength fibres get way worse a hammering from age than endurance type 1 stuff. We all know older people who can walk to the shops and back but can't open a jam jar. Strength is lost way faster than endurance, but brilliant news is strength training in the older population is spectacularly effective. (Links to explanation, actual research etc available to those interested)
Post edited at 13:48