Capacitor specifications, ripple current and life
Electrolytic capacitor lifetime is given in hours at the maximum operating temperature, and that's what it depends on: its operating temperature.
For every 10°C reduction in operating temperature, the capacitor lifetime is doubled, so for a 105°C cap rated for 2,000 hours that means that it could last about 32 times longer, or about 64,000 hours at 55°C.  

The ripple current rating tells you the manufacturer's recommended maximum so that it doesn't cause a detrimental rise of the capacitor's temperature. You could ignore it and that will shorten the capacitor's lifetime.  

You should either use a larger capacitor or multiple capacitors in parallel so that their combined rated ripple current is higher, and their combined ESR is lower than the ones calculated for your circuit. Using higher (than calculated) capacitor values can only benefit both your circuit and your capacitors (and their lifetime), while using lower values will shorten the lifetime of the capacitors and the circuit along with them, and could also impair the circuit's functioning.