  Upon its discovery in 2006, the young L7.5 companion to the solar analog HD
203030 was found to be unusual in being $\approx$200 K cooler than older late-L
dwarfs. HD 203030B offered the first clear indication that the effective
temperature at the L-to-T spectral type transition depends on surface gravity:
now a well-known characteristic of low-gravity ultra-cool dwarfs. An initial
age analysis of the G8V primary star indicated that the system was 130--400 Myr
old, and so the companion between 12--31 $M_{\rm Jup}$. Using moderate
resolution near-infrared spectra of HD 203030B, we now find features of very
low gravity comparable to those of 10--150 Myr-old L7--L8 dwarfs. We also
obtained more accurate near infrared and {\sl Spitzer}/IRAC photometry, and
find a $(J-K)_{\rm MKO}$ color of $2.56\pm0.13$ mag---comparable to those
observed in other young planetary-mass objects---and a luminosity of
log($L_{\rm bol}/L_{\odot}$)$\,=\,-4.75\pm0.04$ dex. We further reassess the
evidence for the young age of the host star, HD 203030, with a more
comprehensive analysis of the photometry and updated stellar activity
measurements and age calibrations. Summarizing the age diagnostics for both
components of the binary, we adopt an age of 100 Myr for HD 203030B and an age
range of 30--150 Myr. Using cloudy evolutionary models, the new companion age
range and luminosity result in a mass of 11 $M_{\rm Jup}$ with a range of 8--15
$M_{\rm Jup}$, and an effective temperature of $1040\pm50$ K.
