Q.My elaeagnus is dying after 20 years
Elaeagnus planted more than 20 years ago now has crinkled leaves and looks as if it’s dying. Is this normal or is it happening elsewhere? No sign of any new growth this year.

If you had a particularly harsh winter, your elaeagnus may have suffered a cold injury or, given that your bush is 20 years old, it could be old age and weariness. It could also be the work of an insect - the "vine weevil" is known to feast on elaeagnus shrubs.
For information on winter injury in shrubs and how to treat it, please visit the following link:
https://www.gardeningknowhow.com/ornamental/shrubs/shgen/winter-damage-of-shrubs.htm
For more information on weevils, go here:
https://www.gardeningknowhow.com/plant-problems/pests/insects/controlling-root-weevil.htm
For information on how to care for elaeagnus plants, please visit the following link:
https://www.gardeningknowhow.com/ornamental/shrubs/elaeagnus/russian-olive-information.htm