In his commentary on old King Solomon’s need to sleep with a maiden hot enough to keep him warm and holy enough not to arouse his lust, Saint Jerome has this to say:
Who is this Shunammite, both wife and virgin, so hot that she could heat the frozen, so holy that she did not rouse to lust him whom she had warmed?
He goes on to explain that wisdom is the maiden who comes to embrace us in old age:
In the aged, nearly all the bodily powers wear out,
and wisdom alone increases;
all the others decrease:
such as fasting, watching, sleeping on the floor,
travelling from place to place,
defending the poor,
being instant and persevering in prayer,
visiting the sick,
manual labour for the providing of alms.
And without prolonging my discourse,
all those things that are done through the body diminish
as the body breaks down.
I do not mean to say that wisdom,
which in many of the aged declines into senility
is lacking in the young or in those of maturer age;
that is, in those who by toil or earnest zeal,
by holiness of life,
and by frequent prayer to the Lord Jesus,
so seek after knowledge:
but I mean that many who are young in body
have a battle to fight,
and amidst the incentives to sin
and the temptations of the flesh,
wisdom is smothered as fire is in green wood,
so that its flame cannot leap forth.
But when old age comes upon those
who have spent their youth in acquiring knowledge
and have exercised themselves in the law of the Lord day and night,
then they become more learned with age,
more skilled through experience,
wiser as time goes by,
and they reap the most sweet fruit from their diligence.
Saint Jerome, Letter to Nepotian