Employability is typically defined as
the continuous fulfilling, acquiring or creating of work through the optimal use of competences. (Van der Heijde & Van der Heijden, 2006)
One's employability does not only depend on one's ability to work (both physically and mentally), but also one's motivation to work and learn and the opportunity to work (Brouwers, 2012; dutch citation).
Especially for elders, who are getting older and older, and have to work longer (i.e. until a higher age), employability is becoming incredibly relevant. They need to be able (and willing) to keep on working until their retirement, either in their current position or another less demanding job. This is a difficult job without clear insights. However, with such an incredibly broad term, it will even be difficult to gain those insights.
Are there tools available to asses the personal factors of individuals' employability?
Brouwer, S., de Lange, A., van der Mei, S., Wessels, M., Koolhaas, W., Bültmann, U., ... & van der Klink, J. (2012). Duurzame inzetbaarheid van de oudere werknemer: stand van zaken. Universitair Medisch Centrum Groningen, Groningen: Rijksuniversiteit Groningen.