Coolant colour can't be relied on as there's no actual standard - but red/pink are usually 5-year longlife coolants and green/blue usually 2 year normal coolant.

At that age I'd do a complete coolant change - if there's no drain tap on the radiator, undo the bottom hose and let as much drain out as possible - then start the engine for a few minutes and keep a garden hose topping up the expansion bottle so that clear water is running through - if you start with a cold engine it won't overheat in a few minutes.

Do uo the drain tap and/or bottom hose and then add 50% of the nominal coolant quantity and top up with fresh water. Run the engine at idle, continuously topping up the expansion bottle to the minimum. Then each morning for a week top up to the required level with fresh water before starting the engine.

The coolant and fresh water will soon mix over several cold start cycles.

Do not use blue-- it may be unsuitable for the seals.

Use red or pink. Toyota use OAT - longlife - 10 years - which is pink. Halfords own longlife antifreeze is pink. I believe it is inetrchangeable with Toyota's oroginal fill.

As above, mixing antifreeze types is not a good idea...Change type should mean a full drain (incl heater - set heater to HOT) .

Careful when refilling to remove all airlocks.