By searching the IRAS and ISO databases we compiled a list of 60 debris disks which exhibit the highest fractional luminosity values ( f _ { d } > 10 ^ { -4 } ) in the vicinity of the Sun ( d < 120 pc ) .
Eleven out of these 60 systems are new discoveries .
Special care was taken to exclude bogus disks from the sample .
We computed the fractional luminosity values using available IRAS , ISO , and Spitzer data , and analysed the galactic space velocities of the objects .
The results revealed that stars with disks of high fractional luminosity often belong to young stellar kinematic groups , providing an opportunity to obtain improved age estimates for these systems .
We found that practically all disks with f _ { d } > 5 { \times } 10 ^ { -4 } are younger than 100 Myr .
The distribution of the disks in the fractional luminosity versus age diagram indicates that ( 1 ) the number of old systems with high f _ { d } is lower than was claimed before ; ( 2 ) there exist many relatively young disks of moderate fractional luminosity ; and ( 3 ) comparing the observations with a current theoretical model of debris disk evolution a general good agreement could be found .