riper , ripest
Ripe fruit or grain is fully grown and ready to eat.
Always choose firm, but ripe fruit.
要挑选结实但成熟的水果。
If a situation is ripe for a particular development or event, you mean that development or event is likely to happen soon.
A hospital consultant said conditions were ripe for an outbreak of cholera and typhoid.
一位医院的专家医师说霍乱和伤寒爆发的条件已经成熟。
ripe old age
If someone lives to a ripe old age, they live until they are very old.
He lived to the ripe old age of 95.
他活到了95岁的高龄。