Gs, Glr, executive function and aging

I just skimmed the interesting article below. The abstract is pretty much self-explanatory. If one uses their CHC-SL (CHC as a Second Language) skills, the CHC interpretation is that the study focuses on Glr (recognition memory), Gs and executive functions (which seems to be Gf related).

Bunce, D., & Macready, A. (2005). Processing speed, executive function, and age differences in remembering and knowing. Quarterly Journal of Experimental Psychology Section A Human Experimental Psychology, 58(1), 155-168.

Abstract
A group of young ( n = 52, M = 23.27 years) and old ( n = 52, M = 68.62 years) adults studied two lists of semantically unrelated nouns. For one list a time of 2 s was allowed for encoding, and for the other, 5 s. A recognition test followed where participants classified their responses according to Gardiner's (1988) remember-know procedure. Age differences for remembering and knowing were minimal in the faster 2-s encoding condition. However, in the longer 5-s encoding condition, younger persons produced significantly more remember responses, and older adults a greater number of know responses. This dissociation suggests that in the longer encoding condition, younger adults utilized a greater level of elaborative rehearsal governed by executive processes, whereas older persons employed maintenance rehearsal involving short-term memory. Statistical control procedures, however, found that independent measures of processing speed accounted for age differences in remembering and knowing and that independent measures of executive control had little influence. The findings are discussed in the light of contrasting theoretical accounts of recollective experience in old age.