The phrase "substantial age" is correct and usable in written English.
It is often used to describe someone who is advanced in years or has reached a significant amount of time in their life. Example: The new laws are unfair to workers of substantial age who are forced to retire before they are ready.
The number of very large craters in the southern highlands implies a substantial age for the surface.
As a member of a San Francisco neighborhood council put it: "There is a substantial age and experience divide on this issue.
There was a substantial age gap between me and my siblings, and I could usually be counted on to keep the little ones undrowned, unelectrocuted, fed, watered, rediapered.
With so many players participating in junior leagues before attending college, the result is a substantial age difference between the hockey players and the rest of the student body.
It was significantly negatively associated with living in the Northern Province, the relationship being poor and there being a substantial age difference between partners.
A number of recently published studies have established a substantial age dependence of the response of ACL fibroblasts to stimulation by platelet-rich plasma (PRP).
Studies of primary somatosensory cortex (SI) of aged rats have reported substantial, age-related enlargements of hindpaw receptive fields (RFs) (Spengler et al. 1995; Godde et al. 2002; David-Jurgens et al. 2008).
On the other side of this controversy are authors who conclude that prospective memory shows substantial age-related declines.
While some researchers view the literature as showing no age-related declines in prospective memory, others see the literature as showing "substantial" age-related declines.
When the task was so easy that older adults scored perfect (p = 1.0 or 100%) no age-related declines could emerge, whereas when the task was more difficult substantial age-related declines emerged.
The substantial age-related declines in ProM with both focal and non-focal cues directly contradicts Einstein, McDaniel, and their colleagues' claims that aging spares prospective memory with focal cues, consistent with previous findings by Uttl [2] and Kliegel et al. [25].
